Specifications

Product Technical Specification & Customer Design Guidelines

68 Proprietary and Confidential - Specifications subject to change 2400058

5.3 Reset Signal (SYSTEM_RESET_N)

This signal is used to force the AirPrime SL808X Embedded Module to reset.

Note that an operating system reset is preferred to a hardware reset.

Caution: This signal should only be used for EMERGENCY resets.

5.3.1 Pin descriptions

Tabl e 5- 5 describes the SYSTEM_RESET_N signal pin.

See Digital I/O electrical information on page 39 for1V8 voltage characteristics

and reset state definitions.

5.3.2 Electrical characteristics

Tabl e 5- 6 describes the reset signal’s electrical characteristics.

Refer to Ta bl e 4 - 2 on page 34 for basic characteristics (type, voltage).

Table 5-4: Reset signal features

Feature Details

Purpose Reset modem

• Used by host to reset the modem.

Implementation • Digital input. 1.8 V logic

• Signal is driven only by an open-drain output from the host.

• Host must provide a 50-100 k external pull-up resistor to 1.8 V.

Note: This pin is also required for JTAG programming.

Table 5-5: Reset signal pin description

Pin Signal I/O I/O type Description

63 SYSTEM_RESET_N I 1V8 Embedded module

reset

Table 5-6: Reset signal electrical characteristics

Parameter Minimum Typical Maximum Unit

Input impedance (R)

100 k

Input impedance (C) 10n F

SYSTEM_RESET_N

time (Rt)

200 us